怎么做（我直接敲代码，有解释）===新闻发布系统（2）

2020-05-11 阴天

　　我在上一随笔，菜鸡的介绍了我大概需要完成什么，什么技术，什么功能

　　所以在这章开始我就直接敲代码，在敲代码的情况下，我会详细介绍功能（我理解的）

我可能会出现错误，希望大佬们看到问题，可以指点我，谢谢：

项目结构

    ├── README.md 
    ├── config  -- 项目资源文件
    |      ├── news_table.sql 项目数据库创建和表创建的SQL语句
    |      ├── c3p0-config.xml c3p0连接池配置文件
    |      ├── dao.properties 
    |      └── service.properties
    └── src
    |    └── com
    |        └── jsj
    |             ├── servlet  web层
    |             ├── dao  -- dao持久层
    |             ├── entity  -- 实体类
    |             ├── factory  -- 工厂类
    |             ├── filter  -- 过滤器
    |             ├── utils  -- 工具类
    |             └── service  -- service业务层
    └── web
         └── WEB-INF
         |      ├── lib  -- 项目相关依赖
         |      ├── view  -- 视图页面目录
         |      └── web.xml  -- web部署文件
         └── static
                ├── bootstrap-4.3.1-dist  -- bootstrap依赖文件
                ├── wangEditor  -- 富文本编辑器依赖文件
                ├── css  -- 样式文件
                ├── images  -- 图片文件
                └── js  -- javascript脚本文件

我从数据库开始：

　　数据库需要：admin（管理员表）user(用户表）new_cate(新闻分类）news(新闻内容）newst(没有用）

代码：（可以直接运行）

/*
SQLyog Ultimate v12.08 (64 bit)
MySQL - 8.0.16 : Database - news
*********************************************************************
*/


/*!40101 SET NAMES utf8 */;

/*!40101 SET SQL_MODE=''*/;

/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;
CREATE DATABASE /*!32312 IF NOT EXISTS*/`news` /*!40100 DEFAULT CHARACTER SET utf8 */ /*!80016 DEFAULT ENCRYPTION='N' */;

USE `news`;

/*Table structure for table `admin` */

DROP TABLE IF EXISTS `admin`;

CREATE TABLE `admin` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(10) NOT NULL,
  `password` varchar(24) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;

/*Table structure for table `news` */

DROP TABLE IF EXISTS `news`;

CREATE TABLE `news` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `cate_id` int(11) NOT NULL,
  `title` varchar(100) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `time` date NOT NULL,
  `author` varchar(15) NOT NULL,
  `content` varchar(20000) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=13 DEFAULT CHARSET=utf8;

/*Table structure for table `news_cate` */

DROP TABLE IF EXISTS `news_cate`;

CREATE TABLE `news_cate` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(12) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=10 DEFAULT CHARSET=utf8;

/*Table structure for table `user` */

DROP TABLE IF EXISTS `user`;

CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(10) NOT NULL,
  `password` varchar(24) NOT NULL,
  `birthday` date NOT NULL,
  `email` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `tel_number` varchar(15) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;

/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;

数据库完成的图片：

然后我从实体层开始写

 创建com.jsj.entity包：

Admin.java

作用：管理员登录

代码：

package com.jsj.entity;

public class Admin{

    private Integer id;

    private String username;

    private String password;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

}

News.java

作用：就是新闻主题内容

代码：

package com.jsj.entity;

import java.util.Date;

public class News {

    private Integer id;

    private Integer cateId;

    private String title;

    private Date time;

    private String author;

    private String content;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public Integer getCateId() {
        return cateId;
    }

    public void setCateId(Integer cateId) {
        this.cateId = cateId;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public Date getTime() {
        return time;
    }

    public void setTime(Date time) {
        this.time = time;
    }

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }

}

NewCate.java

作用：新闻分类所属的新闻列表

代码：

package com.jsj.entity;

import java.util.List;

/**
 * 新闻分类所属的新闻列表
 */
public class NewsCateVo {

    private Integer cateId;

    private String name;

    private List<News> news;

    public Integer getCateId() {
        return cateId;
    }

    public void setCateId(Integer cateId) {
        this.cateId = cateId;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public List<News> getNews() {
        return news;
    }

    public void setNews(List<News> news) {
        this.news = news;
    }

}

NewVo.java

作用：实现新闻分类的操作

代码：

package com.jsj.entity;

public class NewsVo extends News {

    private NewsCate newsCate;

    public NewsCate getNewsCate() {
        return newsCate;
    }

    public void setNewsCate(NewsCate newsCate) {
        this.newsCate = newsCate;
    }

}

Page.java

作用：封装分页结果集

代码：

package com.jsj.entity;

import java.io.Serializable;
import java.util.List;

/**
 * 封装分页结果集
 */
public class Page<T> implements Serializable {

    //当前页
    private int pageIndex;

    //总页数=总记录数/每页显示的记录数
    private int totalPage;

    //总记录数
    private int totalCount;

    //每页显示的记录数
    private int pageSize;

    //每页显示的数据
    private List<T> beanList;

    public int getPageIndex() {
        return pageIndex;
    }

    public void setPageIndex(int pageIndex) {
        this.pageIndex = pageIndex;
    }

    public int getTotalPage() {
        return totalPage;
    }

    public void setTotalPage(int totalPage) {
        this.totalPage = totalPage;
    }

    public int getTotalCount() {
        return totalCount;
    }

    public void setTotalCount(int totalCount) {
        this.totalCount = totalCount;
    }

    public int getPageSize() {
        return pageSize;
    }

    public void setPageSize(int pageSize) {
        this.pageSize = pageSize;
    }

    public List<T> getBeanList() {
        return beanList;
    }

    public void setBeanList(List<T> beanList) {
        this.beanList = beanList;
    }

}

User.java

作用：用户的注册和登录需要用到的，存储数据，可以这么理解

代码：

package com.jsj.entity;

import java.util.Date;

public class User {

    private Integer id;

    private String username;

    private String password;

    private Date birthday;

    private String email;

    private String telNumber;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getTelNumber() {
        return telNumber;
    }

    public void setTelNumber(String telNumber) {
        this.telNumber = telNumber;
    }

}